[Voluntary control of lengthened and intact limbs muscles tension under different force load ranges].

Abstract

The data are presented which supporting the hypothesis of the presence of isometric force load zone, within which the subjects tested organize the voluntary muscle tension controlling with maximal accuracy and minimal specific power expenses, estimated indirectly, by the ratio of the surface electromyogram (EMG) area (integral of EMG) to force moment impulse. The asymmetries of the integral values of visual-and-motor tracking have been analyzed as well using isometric control organs in 23 patients at the age of 15-35 years (6 - males and 17 - females) in different periods after surgical elimination of lower limb length discrepancies. Poorly marked zone of minimization of integral discrete visual-and-motor tracking estimates, manifesting itself within 25-35% of the maximal force of the muscle group tested (foot dorsal flexors) has been noted in tested healthy subjects (26 normal males at the age of 19-39 years) and orthopedic patients (intact limb). The zone of "optimal' loads is marked more clearly on patients' lengthening side with the tendency towards its shift to the area of weaker forces.